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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

21470 results found.

  1. GRB 241115B: Swift/BAT-GUANO localization skymap of a long burst
  2. GRB 241115C: Fermi GBM Observation
  3. GRB 241115A: Swift-XRT afterglow detection
  4. EP241115a/GRB 241115D: Optical upper limits with Kinder observations
  5. EP241115a/GRB 241115D: Swift/XRT follow-up observation
  6. EP241113a: Swift XRT weak detection
  7. GRB 241115A: Fermi GBM Observation
  8. GRB 241115A: LCOGT Optical Upper Limits
  9. GRB 241115C: Swift/BAT-GUANO localization skymap of a burst
  10. Swift GRB 241115A: Global MASTER-Net observations report
  11. GRB 241115A: Swift detection of a burst
  12. GRB 241113A: Swift-BAT refined analysis
  13. GRB 241113A: PRIME near-infrared upper limits
  14. GRB 241113A: J-band observations with WINTER
  15. GRB 241113B: Swift-XRT observations
  16. GRB 241113A: 1.6m Mephisto and 50cm array optical upper limits
  17. GRB 241113A: KAIT optical observations
  18. GRB 241113A: Swift-XRT refined Analysis
  19. GRB 241113A: Swift/UVOT Detection
  20. GRB 241113A: REM detection of the optical/NIR afterglow
  21. Konus-Wind detection of GRB 241107A (short/hard)
  22. GRB 241113B: Swift ToO observations
  23. GRB 241113A: LCO optical observations
  24. GRB 241113A: Enhanced Swift-XRT position
  25. GRB241113A: LCOGT (40-cm) optical counterpart detection
  26. GRB 241113A: MASTER010615.66-224018.2 optical counterpart detection
  27. GRB 241113A: Swift detection of a burst with an optical counterpart
  28. Swift GRB241113.33: Global MASTER-Net observations report
  29. GRB 241107A: GROWTH-India telescope optical upper limit
  30. GRB 241112B: Swift-XRT afterglow detection
  31. GRB 241107A: Swift/BAT candidate arcminute localization of a short burst
  32. GRB 241112B: Swift ToO observations
  33. GRB 241107A: INTEGRAL IBIS localization
  34. IPN triangulation of GRB 241107A (short/hard)
  35. GRB 241025A: VZLUSAT-2 detection
  36. GRB 241108A: Further COLIBRÍ Upper Limits on the Optical Counterpart
  37. GRB 241108A: Swift-XRT observations
  38. GRB 241108A: Swift ToO observations
  39. GRB 241030A: TESS observations
  40. GRB 241105A: EP-FXT follow-up observations
  41. GRB 241105A: SVOM/GRM observation
  42. GRB 241105a: PRIME near-infrared upper limits
  43. GRB 241105A: Swift/UVOT Detection
  44. GRB 241105A: Swift/BAT-GUANO refined analysis of short burst with extended emission
  45. GRB 241030A: optical afterglow detection from the INAF Asiago Observatory
  46. GRB 241105A: BOOTES-7 optical detection
  47. GRB 241105A: Fermi GBM Observation of a Short Burst with Extended Emission
  48. GRB 241105A: Swift-XRT afterglow detection
  49. GRB 241104A: Swift-XRT observations
  50. GRB 240511A: LCO upper limits
  51. GRB 241105A: Swift ToO observations
  52. GRB 241105A: Swift/BAT-GUANO arcminute localization of a short burst
  53. GRB 241104A: Swift ToO observations
  54. GRB 241030A: GRBAlpha detection
  55. EP241103a: GIT optical upper limit
  56. EP241103a: GOTO optical upper limit
  57. EP241103a: Swift XRT detection and improved X-ray position
  58. GRB 241030A: Swift-UVOT observations of the optical prompt flare
  59. GRB 241030A: Rapid release of TESS data.
  60. Swift GRB 241101A: Global MASTER-Net observations report
  61. GRB 241101A: FRAM-ORM optical limit
  62. GRB 241101A: Swift-BAT refined analysis
  63. GRB 241030B: Swift-XRT refined Analysis
  64. GRB 241030A / EP241030a: GMG possible spectroscopic redshift at z ~ 1.4
  65. GRB 241101A: Swift detection of a burst
  66. GRB 241030B: NUTTelA-TAO / BSTI Optical Limits
  67. GRB 241030B: Montarrenti Observatory optical upper limit
  68. GRB 241030A / EP241030a: FTW Optical and NIR observations of the optical counterpart
  69. GRB 241030A: Fermi GBM Observation
  70. GRB 241030B: LCOGT Optical Upper Limits
  71. GRB 241030B: Swift-BAT refined analysis
  72. GRB 241030A: Swift-BAT refined analysis
  73. GRB 241030B: Swift/UVOT Detection
  74. GRB 241029A: LCO optical detection
  75. Swift GRB241030.77: Global MASTER-Net observations report
  76. GRB 241030B: SVOM/GRM observation
  77. GRB 241030B : MITSuME Akeno optical upper limits
  78. GRB 241030A: COLIBRI Continuing Detection of the Afterglow
  79. GRB 241030B: COLIBRÍ Upper Limits on the Optical Counterpart
  80. GRB241030B: Fermi GBM Observation
  81. GRB 241030A: detection of the bright optical counterpart in ATLAS forced photometry
  82. GRB 241030B: Enhanced Swift-XRT position
  83. GRB 241030B: optical observations from the INAF Asiago Observatory
  84. EP241021a: Swift-UVOT detection
  85. GRB241030B: GRANDMA/TAROT Upper Limit
  86. GRB 241030A: Swift-XRT refined Analysis
  87. GRB 241030B: AKO Optical Afterglow Detection
  88. GRB 241030B: Nanshan/HMT optical afterglow detection
  89. GRB 241030B: SVOM/ECLAIRs detection of a burst
  90. GRB 241030B: Prompt enhanced Swift-XRT position
  91. Konus-Wind detection of GRB 241030A
  92. GRB 241030B: Swift detection of a burst
  93. GRB 241030A: Fermi-LAT detection
  94. GRB 241030A: AKO Optical Afterglow Detection
  95. Swift GRB 241030A: Global MASTER-Net observations report
  96. GRB 241030A: Swift/UVOT Detection
  97. EP 241021a: further Swift-XRT observations and X-ray counterpart detection
  98. GRB 241030A: SVOM/GRM observation
  99. GRB 241026A: Swift-BAT refined analysis
  100. GRB 241030A: SVOM/C-GFT optical observations

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